Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/96.0.4664.53 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 96

Operating system: iOS 15.7

Device Platform: Mobile

Date tested: 2 years ago

getElementById

3.9M/s

querySelector

3.0M/s

View exact numbers

Test name	Executions per second
✓ getElementById	3,907,503 Ops/sec
querySelector	2,962,711 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;